Gender parity and behaviour of high net worth collectors are focuses of the study, which calculates market grew to $67.4bn in 2018

After the fair's last-minute relocation that displaced Volta from Pier 90, exhibitors from both fairs credit 'generous' community support for good business

Founded in 1972 to support women artists, the non-profit gallery will use the proceeds to fund its fellowship programme

Overall results are down 42.7% on last year, but European buying remains strong despite Brexit

Jenny Saville's Juncture sells for £5.4m and records set for Rebecca Warren and Nigerian artist Toyin Ojih Odutola, but Jean-Michel Basquiat still leads prices

London-based gallery will team up with interior designer Chahan to create "home of a 21st-century Grand Tourist" in the medieval Abbazia di San Gregorio

Works in the 2019 edition of the fair aim to blur the lines between reality and perception

Tefaf Maastricht's removal of art trade professionals as voting members of its vetting committee raises the wider question of the role of self-policing by fairs

British art dealers will open in Cheim & Read's former Chelsea space in May with a show of Malian artist Abdoulaye Konaté

Armory Show shifts venues, causing the cancellation of Volta and the emergency launch of Plan B, revealing the stakes for commercial art platforms are rising

Our highlights from upcoming fairs and auctions

Political turmoil and economic crisis keep collectors away from countries such as Venezuela, so galleries rely more on fairs

After announcing it would launch new international events in 2017, London fair takes cautious approach with pavilion within existing fair this October

Co-presentations and “collegiality” prove strengths of the 31st edition, which runs through 3 March

Auction house reports $6.4bn in total sales last year, while chief executive Tad Smith says guarantees are not "at a particularly high level"

Impressionist, Modern and Surrealist art auction makes second highest total for Christie's London at £165.4m, but much of overpriced collection goes unsold

£63m auction total is half that of last year, but bidding from Asia and Russia helps make new record for Oskar Schlemmer and a Venetian view by Monet

Our highlights from upcoming fairs and auctions

Shop's programme highlights Crossrail artists’ commissions including Chantal Joffe, Yayoi Kusama and Darren Almond

Papers show Tefaf sought New York Supreme Court ruling releasing it from obligation to employ Artvest for bi-annual fairs

Facing 30 months in prison beginning in May, the dealer calls herself the "Martha Stewart of the art world"

Western interest in contemporary works from the continent is at a high, but that can be a double-edged sword

Unforeseen structural issues have forced a third of the Armory's exhibitors out of their planned Pier 92 space and into Volta's venue

Fledgling local client base and rising international interest fuel Cape Town and Marrakech shows

The conviction follows a seven-year investigation into the Swiss banking giant by French authorities

Resolution includes proposals for database of looted art, support for provenance research and exemptions from statutes of limitations

Proceeds would go toward acquisitions that “address art historical gaps’’

New York art dealer falsely claimed around $1.6m in personal expenses as tax-deductible business expenses in 2011

Last year, the LA gallery took on Michael Williams, Fred Eversley, Huma Bhabha and Lauren Halsey

Having for years viewed each other with suspicion, relations between agencies and galleries may start warming up